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Harlequin vs Tad: catalog facts
Harlequin	Tad
Free Free and open source, supported through GitHub Sponsors.	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Full SQL IDE inside the terminal, usable over SSH Adapters for DuckDB, SQLite, Postgres and more	Opens CSV, Parquet, SQLite and DuckDB data in one app Pivot table view for exploring data without code
Installed through Python, and newer Python versions may not be supported by all dependencies Terminal interface rather than a graphical client	Hobby project with known bugs and rough edges Releases are infrequent; the latest is from June 2024
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.